Fire-resistant cable manufacturing method

Abstract

The invention relates to the technical field of cable manufacturing, and discloses a fire-resistant cable manufacturing method comprising the following steps: conductor manufacturing: stranding conductors; insulation manufacturing: extruding an insulation outer layer outside the conductor to form an insulation wire core; fire-resistant manufacturing: longitudinally wrapping a mica layer of which the inner surface is provided with a hot melt adhesive outside the insulating wire core, then fixing the mica layer by adopting a ribbon, and then feeding into a drying oven for heating to enable the mica layer to be tightly bonded with the insulating outer layer and the mica layer to form a fireproof wire core; pair twisting: twisting the two fire-resistant wire cores together to form a twisted pair; cabling: twisting a plurality of twisted pairs together to form a multi-twisted wire; braiding: longitudinally wrapping an aluminum foil layer outside the multi-stranded wire, and braiding a braided layer outside the aluminum foil layer to form a braided cable core; and extruding a sheath: extruding a thermoplastic material layer outside the braided cable core. The method is high in productionefficiency, simple and convenient to manufacture and cost-saving, and the produced cable is excellent in fire resistance and transmission performance and good in anti-interference performance.

Description

technical field [0001] The invention relates to the technical field of cable production, in particular to a method for producing a fire-resistant cable. Background technique [0002] With the development of science and technology, the amount of information exchange is increasing, and the wiring system is becoming more and more dense. Coupled with external factors, the cable may encounter fire during use. If the cable can still last for a period of time under the flame Normal power supply can facilitate escape, rescue and buy time for the backup of key data. However, most cables on the market are not fire resistant. The situation occurred, which caused a series of heavy losses. [0003] At present, some enterprises and designers, in order to improve the fire resistance of cables, ensure that the cables can be used normally for a long time in a fire, and ensure the normal transmission and feedback of information, the patent document with the publication number CN105976904A pr...

AI Technical Summary

Problems solved by technology

However, the above method limits the development of the diameter of the conductor to be smaller. When the conductor is thinner, the width of the mica layer that can be used is relatively narrow, and the mica is fixed by wrapping. In order to cover the conductor more perfectly, it will inevitably lead to production The speed is greatly reduced, the construction period is prolonged, and the production cost cannot be increased due to mass production. The fire resistance and data transmission are good, but the market promotion rate is low. In addition, in order to ensure fire resistance, the wrap must be completely and fully wrapped around the conductor. Higher requirements are put forward for the accuracy of wrapping equipment; the silicone rubber insulation layer is extruded outside the mica layer, which is relatively easy to damage and increases data transmission interference. The setting of metal inner and outer sheaths increases the difficulty and cost of manufacturing technology. To a certain extent, it also limits the deformation capacity of the cable

[0005] In addition, the mica layer is fixed by wrapping, which also affects the subsequent twisting process of some data transmission cables. When twisting, the twisting direction will be opposite to the wrapping direction of the mica layer, which is prone to back twisting. , causing the mica layer to loosen, which in turn leads to a decrease in fire resistance